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1 //-----------------------------------------------------------------------------
2 // Merlok - 2012
3 //
4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
5 // at your option, any later version. See the LICENSE.txt file for the text of
6 // the license.
7 //-----------------------------------------------------------------------------
8 // Routines to support mifare classic sniffer.
9 //-----------------------------------------------------------------------------
10
11 #include "mifaresniff.h"
12 #include "apps.h"
13 #include "proxmark3.h"
14 #include "util.h"
15 #include "string.h"
16 #include "iso14443crc.h"
17 #include "iso14443a.h"
18 #include "crapto1/crapto1.h"
19 #include "mifareutil.h"
20 #include "common.h"
21
22
23 static int sniffState = SNF_INIT;
24 static uint8_t sniffUIDType;
25 static uint8_t sniffUID[8] = {0x00};
26 static uint8_t sniffATQA[2] = {0x00};
27 static uint8_t sniffSAK;
28 static uint8_t sniffBuf[16] = {0x00};
29 static uint32_t timerData = 0;
30
31
32 bool MfSniffInit(void){
33 memset(sniffUID, 0x00, 8);
34 memset(sniffATQA, 0x00, 2);
35 sniffSAK = 0;
36 sniffUIDType = SNF_UID_4;
37
38 return false;
39 }
40
41 bool MfSniffEnd(void){
42 LED_B_ON();
43 cmd_send(CMD_ACK,0,0,0,0,0);
44 LED_B_OFF();
45
46 return false;
47 }
48
49 bool RAMFUNC MfSniffLogic(const uint8_t *data, uint16_t len, uint8_t *parity, uint16_t bitCnt, bool reader) {
50
51 if (reader && (len == 1) && (bitCnt == 7)) { // reset on 7-Bit commands from reader
52 sniffState = SNF_INIT;
53 }
54
55 switch (sniffState) {
56 case SNF_INIT:{
57 if ((len == 1) && (reader) && (bitCnt == 7) ) { // REQA or WUPA from reader
58 sniffUIDType = SNF_UID_4;
59 memset(sniffUID, 0x00, 8);
60 memset(sniffATQA, 0x00, 2);
61 sniffSAK = 0;
62 sniffState = SNF_ATQA;
63 if (data[0] == 0x40)
64 sniffState = SNF_MAGIC_WUPC2;
65 }
66 break;
67 }
68 case SNF_MAGIC_WUPC2:
69 if ((len == 1) && (reader) && (data[0] == 0x43) ) {
70 sniffState = SNF_CARD_IDLE;
71 }
72 break;
73 case SNF_ATQA:{
74 if ((!reader) && (len == 2)) { // ATQA from tag
75 memcpy(sniffATQA, data, 2);
76 sniffState = SNF_UID1;
77 }
78 break;
79 }
80 case SNF_UID1:{
81 if ((reader) && (len == 9) && (data[0] == 0x93) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) { // Select 4 Byte UID from reader
82 memcpy(sniffUID + 3, &data[2], 4);
83 sniffState = SNF_SAK;
84 }
85 break;
86 }
87 case SNF_SAK:{
88 if ((!reader) && (len == 3) && (CheckCrc14443(CRC_14443_A, data, 3))) { // SAK from card?
89 sniffSAK = data[0];
90 if ((sniffUID[3] == 0x88) && (sniffUIDType == SNF_UID_4)) { // CL2 UID part to be expected
91 sniffUIDType = SNF_UID_7;
92 memcpy(sniffUID, sniffUID + 4, 3);
93 sniffState = SNF_UID2;
94 } else { // select completed
95 sniffState = SNF_CARD_IDLE;
96 }
97 }
98 break;
99 }
100 case SNF_UID2:{
101 if ((reader) && (len == 9) && (data[0] == 0x95) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) {
102 memcpy(sniffUID + 3, &data[2], 4);
103 sniffState = SNF_SAK;
104 }
105 break;
106 }
107 case SNF_CARD_IDLE:{ // trace the card select sequence
108 sniffBuf[0] = 0xFF;
109 sniffBuf[1] = 0xFF;
110 memcpy(sniffBuf + 2, sniffUID, 7);
111 memcpy(sniffBuf + 9, sniffATQA, 2);
112 sniffBuf[11] = sniffSAK;
113 sniffBuf[12] = 0xFF;
114 sniffBuf[13] = 0xFF;
115 LogTrace(sniffBuf, 14, 0, 0, NULL, true);
116 sniffState = SNF_CARD_CMD;
117 } // intentionally no break;
118 case SNF_CARD_CMD:{
119 LogTrace(data, len, 0, 0, parity, reader);
120 timerData = GetTickCount();
121 break;
122 }
123
124 default:
125 sniffState = SNF_INIT;
126 break;
127 }
128
129
130 return false;
131 }
132
133 bool RAMFUNC MfSniffSend(uint16_t maxTimeoutMs) {
134 if (BigBuf_get_traceLen() && (GetTickCount() > timerData + maxTimeoutMs)) {
135 return intMfSniffSend();
136 }
137 return false;
138 }
139
140 // internal sending function. not a RAMFUNC.
141 bool intMfSniffSend() {
142
143 int pckSize = 0;
144 int pckLen = BigBuf_get_traceLen();
145 int pckNum = 0;
146 uint8_t *trace = BigBuf_get_addr();
147
148 FpgaDisableSscDma();
149 while (pckLen > 0) {
150 pckSize = MIN(USB_CMD_DATA_SIZE, pckLen);
151 LED_B_ON();
152 cmd_send(CMD_ACK, 1, BigBuf_get_traceLen(), pckSize, trace + BigBuf_get_traceLen() - pckLen, pckSize);
153 LED_B_OFF();
154
155 pckLen -= pckSize;
156 pckNum++;
157 }
158
159 LED_B_ON();
160 cmd_send(CMD_ACK,2,0,0,0,0);
161 LED_B_OFF();
162
163 clear_trace();
164
165 return true;
166 }
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